Arsenal are about to meet Evertons demands for Jagielka. AOC isnt ready he will get cup games and the like. If he doesnt sign anyone the they face a real threat for fourth.
The Mata deal is unknown for one thing, only paper calling it off is the Daily Mail, hardly reputable, and like SAF Wenger plays loose with the truth when he needs to. He is also watch Jadson and Costa. Pretty much every Gunner, and reptuable source expects 2 more signings if Wenger has his way
Yeaah they probably should sign one more attacking player so that OAC doesn't have to play too much. Then maybe next season when Arshavin leaves he can take on a bigger role. Obviously Mata would be great but it's unlike Wenger to spend so much on a bench player (if they bring in someone like Mata Gervinho wouldn't be starting XI).
As far as Jagielka goes I think it's a horrible move. Is he that much better than Kosc or Djourou? Why spend 15-20 million on a 28 year old when you already have 4 players at that position, three of whom you've spent big transfer fees on in the past 2 seasons? Footballistically it might be a good decision and help them out a bit but financially speaking it's a bad move.